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HDR Camera Control

Creating HDR(High Dynamic Range) Images requires multiple shots, typically more than the 3 shots usually supported by in-camera bracketing modes. The solution I've devised uses an NSLU2 running Debian, ptpcam(from libptp2) thttpd, a Bluetooth PDA with a Web browser and a couple simple CGI scripts to control a camera which supports PTP control of shutter speed and capturing images.

The script(on my Nikon D70) allows full control of shutter speed and ISO.(HDR bracketing is generally shuteer speed only as changing F-stop will change depth of field and the 'look' of the image.) Control is allowed in as small as 1/3 stop steps from 30 seconds to 1/8000 of a second. A more typical shoot from 30 seconds to 1/125 second with a 1 2/3 stop step takes about 80 seconds to shoot.

The power source is a standard commercial SLA(Sealed Lead Acid) battery connected to a 12V to 5V USB adapter and then a USB cable with an appropriate end to feed the NSLU2, I chose to leave the power button functional to allow the NSLU2 to cleanly be shut down in the field.